The invention belongs to the technical field of material chemistry, and particularly relates to a method for preparing light calcium zinc phosphate anticorrosive pigment. The preparation method comprises the following steps: coating the surface of calcium phosphate powder with a zinc phosphate material by utilizing the reaction between phosphoric acid and calcium carbonate, further generating carbon dioxide gas in the reaction to achieve a grinding effect on the material; adding a zinc nitrate solution into a preparation system by utilizing the chemical replacement reaction, and performing chemical replacement reaction between zinc ions and calcium ions on the material surface so as to obtain the light calcium zinc phosphate anticorrosive pigment having a calcium zinc phosphate outer layerand a calcium carbonate inner layer. According to the method, preparation, grinding and modification of the light calcium zinc phosphate anticorrosive pigment can be synchronously completed, and thelight calcium zinc phosphate anticorrosive pigment has the advantages of stable structure, good dipsersibility, small grain size, good corrosion resistance and the like.